Stop motion assembly



' Nov. 26, 1957 E. M. AYARS, JR, ET AL STOP MOTION ASSEMBLY Filed June6, 1956 United StatesPatent STOP MOTION ASSEMBLY Edward M. Ayars, Jr.,Swarthmore, George W. Beyers, Glen Mills, Robert D. Heifelfinger,Lansdowne, and Joseph A. Truitt, West Chester, Pa., assignors toAmerican Viscose Corporation, Philadelphia, Pa., 2 corporation ofDelaware Application June 6, 1956, Serial No. 589,693 8 Claims. (Cl.28-51) The present invention relates to a novel and improved stop motionassembly for terminating yarn winding or unwinding operations when ayarn is traveling under excess or insufiicient tension.

When collecting a plurality of yarns in a close side-byside relationshipon large beams or spools for later use in fabric-forming operations,such as the warp yarn in knitting or weaving machines, it is highlydesirable to collect the yarns on the beam or spool under equal and uniform tension. If one or several of the yarns being collected on the beamor spool are traveling under excess tension and these yarns are laterused as the warp for a fabric, the final cloth or fabric producedtherefrom will be of extremely poor quality because these over-tensionedyarns will cause puckers or drawn areas Within the finished fabric.Should a yarn or yarns be traveling under insufficient tension, thefinal fabric will have loosely fabricated areas which give a fabric ofpoor quality. In addition, when a woven fabric which has tight or looseends therein is dyed, dye streaks will be formed whereby the fabric mustbe scrapped.

A beam usually contains 800-1200 yarns and it is extremely difiicult tomaintain the yarns under equal and uniform tension as they are beingwound or collected on the beam.

There is a great need for a satisfactory stop motion assembly which willterminate the beaming operation when a yarn or yarns are running underexcess or insuflicient tension with respect to permissible set tensionlimits.

There is still a greater need for a stop motion assembly which willindicate to the operator which of the yarn or yarns were running underexcess tension after the beaming operation has been terminated.

It is one object of our invention to provide a novel and improved stopmotion assembly which may be used in beaming operations to assure thatthe yarns are wound onto the beam under equal and uniform tension.

A further object of our invention is to provide a novel and improveddouble acting stop motion assembly wherein the beaming operation isterminated when a yarn or yarns being collected on a beam or spool arerunning under excess tension or insufficient tension.

Still a further object of our invention is to provide a novel andimproved stop motion assembly which is responsive to both excess andinsuflicient tension in a running yarn or yarns wherein means areprovided for indicating which yarn or yarns were running under excesstension once the beaming operation has been terminated.

Another object of our invention is to provide a pair of electricalsignalling units which are actuated by double acting drop-wires forinitiating the stopping of the beaming operation when the yarn tensionis out of balance with predetermined permissible tension toleranceswherein only one of the electrical signalling units has a groundconnection.

Other objects and advantages of our invention will be- F lice Figure 1is a fragmentary front view of our stop motion assembly;

Figure 2 is a side view partially sectioned of our stop motion assemblyshowing the position of the drop-wire when the yarn threadedtherethrough is running under normal tension conditions;

Figure 3 is a fragmentary view partially sectioned of our stop motionassembly showing the position of the drop-wire after the beamingoperation has been terminated because of insuflicient tension within thetraveling yarn threaded through the wire; and

Figure 4 is a side view partially sectioned of our stop motion assemblyshowing the position of a drop-wire after the winding or beamingoperation has been terminated because of excess tension within therunning yarn threaded through the wire.

Briefly, our invention comprises a first signalling unit such as anelongated electrode bar which loosely supports a plurality ofdouble-acting slotted drop-wires, and a second signalling unit such asan elongated electrode bar which is mounted to one side of the firstunit and which contains an elongated recess. Each drop-wire has ahook-shaped projection extending from one of its sides and is supportedin position during the beaming operation by a single yarn threadedthrough the wire. The first unit or bar serves to terminate the windingor beaming operation when insufiicient tension conditions prevail in arunning yarn or yarns while the second unit or bar initiates thestopping of the beaming operation when excess tension conditions prevailin the yarn. The first signalling unit or bar becomes actuated when adrop-wire or wires are lowered into contact with the first unit or barbecause of insufficient tension or slack within the running yarnthreaded through the wire. The second signalling unit or bar becomesactuated when a hook-shaped projection of a drop-wire or wires becomesseated within the recess of the second electrode bar as the wire orwires are raised by an over-tensioned yarn or yarns.

Referring now to the drawing, our stop motion assembly comprises a firstsignalling unit such as an elongated electrode bar 1 which is mounted atboth ends in a support (not shown). A second similar signalling unit orbar 3 is also mounted in suitable end supports (not shown) to one sideof the first electrode bar 1 as shown more clearly in Figure 2. Theelectrode bar 3 is so positioned that it slants or inclines toward thevertically disposed electrode bar 1. Each of the bars 1 and 3 have alead wire 5 for supplying current to the bars. The first signallingdevice or electrode bar 1 has a ground wire 7 which serves as a groundconnection for both of the bars 1 and 3 as will be explained more fullyhereinafter. For purposes which will be hereinafter explained, a sheetor layer of insulation 4 is afiixed to the surface of the bar 3 whichfaces the electrode bar 1.

A plurality of double-acting drop-wires 9, 9, each of which has anelongated slot 10 cut therethrough, are loosely positioned by theirslots over the bar 1. Each wire 9 has a hole drilled therethrough at oneend in which an eye or ring yarn guide 11 is supported. A yarn 13, whichis to be unwound from a yarn filled bobbin or other supply sourcesupported on a creel and fed to a beam or large spool is threadedthrough the eye guide 11. As mentioned above, a beam carries 800- 1200single yarns or ends whereby it is required that there be acomplementary 800-1200 double-acting dropwires 9, 9 positioned over theelectrode bar 1 to accommodate the same number of yarns or ends leadingfrom a supply creel.

As seen in Figure 2, the yarn travels over guides 17, 17 positioned oneither side of the electrode bars and drop-wires. The guide bars 17, 17are adjustable and may be moved toward and away from each other when 3setting-up the permissible high and low tension limits for the travelingyarns. In addition, the electrode bars 1. and 3 are also adjustablevertically whereby accurate permissible tension ranges may be set up forthe yarns being collected on a beam or spool.

Figure 2 shows the position of one of the drop-wires 9 when a runningyarn l3 threaded through the wire is traveling within the permissibleset tension limits. The yarn 13 supporting the wire 9 drags or urges thedropwire 9 forward in the traveling direction of the yarn so that theforward edge 19 of the drop-wire contacts the insulation layer 4 of theelectrode bar 3. The insulation layer, of course, prevents thecontacting wire 9 from actuating the electrode bar 3.

Should the yarn 13 be traveling under insufficient tension with respectto the permissible tension range originally set up through adjustment ofthe position of the guide bars 17, 17 and the electrode bars 1 and 3,the yarn will become slack whereby the drop-wire 9 will be lowered (seeFigure 3). The tapered upper end of the slot 10 will contact theelectrode bar 1 while the forward edge of the slot will be urged intocontact with the ground casing b as the tapered edge moves downward overthe bar 1. To separate the ground casing b from the bar 1., a layer ofinsulation is provided between the bar 1 and the ground casing b. Undersuch conditions, the electrode bar 1 becomes actuated and transmits asuitable signal to a cut-off or stopping mechanism device (not shown)which terminates the beaming operation. To determine whether or not anyof the wires were running under insufficient tension, the operator needonly examine the bar 1 to see if any of the wires are seated thereupon.

When the beaming operation is terminated because a yarn end or ends aretraveling under excess tension with respect to the permissible set uptension range, the yarn 13 threaded through a drop-wire 9 becomes tautbetween the guide bars 17, 17 whereby the drop-wire is raised withrespect to its normal operating position (Figure 2) over the electrodebar 1. As seen in Figures 2 and 3, the forward or leading edge 19 of thedrop-wire terminates in a hook-shaped projection 25. The electrode bar 3con tains a similar shaped recess 27 in the upper left-hand portion ofthe bar which extends the full length of the bar and receives thehook-shaped projection 25 as the drop-wire 9 is raised by the taut yarn13. The leading edge 19 of the wire 9 rises in contact with theinsulation layer plate 4 of the electrode bar 3 until the tip of thehook-shaped projection rises above the top of the plate 4 at which pointthe forward drag of the traveling yarn 13 urges the projection 25 intothe recess 27 of the electrode bar 3 (see Figure 4). At the same time,the back edge of the slot of the wire is brought into contact with theground casing b of the electrode bar 1. As this action occurs, a contactis set up from the electrode bar 3, through the drop-wire structure 9and through the ground casing 11 of the electrode bar 1 whereby a signalis transmitted to the stopping mechanism for the beaming operation. Theoperator may then examine the recess to determine whether or not any ofthe drop-wires are supported thereby. If he discovers a wire or wires sosupported, he knows that the yarns threaded through these wires wererunning under excess tension.

In certain instances when the yarn 13 is subjected to extreme suddentension of prolonged duration, the hook shaped projection 25 of thedrop-wire 9 will be jerked up above the recess 27 of the bar 3 andremain there. Contact of the hook-shaped projection 25 with the recess27 is thereby prevented. To actuate the electrode bar 3 in thisinstance, the bar 3 has a raised portion or projection 29 which extendsabove and to the rear of the recess 27 of the bar 3. The forward motionor drag of the over-tensioned traveling yarn 13 carries the drop-wire 9forward whereby the leading edge of the wire 19 makes contact with theraised projection 29 to actuate the bar 3..

After the beaming operation has been terminated, the yarn 13 slackensslightly thus permitting the hook-shaped projection 25 to become seatedin the recess 27.

With the above-described stop motion assembly, the operator may easilydetermine which of the yarn or yarns 13 were traveling underinsufiicient or excess tension with respect to the originally set-uptension tolerances. Should the drop-wires 9 be resting upon theelectrode bar It after the operation has been terminated, the operatorimmediately knows the yarn or yarns threaded through these drop-wireswere traveling under unsuflicient tension. Should the hook-shapedprojections of the drop-wires 9 be seated within the recess 27 of theelectrode bar 3, the operator will immediately know that the yarnsthreaded through these supported drop-wires were traveling under excesstension.

It is easily seen that we have provided a stop motion device of theabove nature which is of simple structure and of non-complicatedoperation. As mentioned above, a variety of tension tolerances may beset up within the device by merely adjusting the position of guide bars17, 17 and the electrode bars 1 and 3. In addition to the above, theoperator may easily determine by a glance which yarn or yarns wererunning under insufficient or excess tension with respect to theexisting tension tolerances of the device.

It is to be understood that changes and variations may be made withoutdeparting from the spirit and scope of the present invention as definedin the appended claims.

We claim:

1. A stop motion assembly for use in terminating yarn beaming operationswhen a yarn is running under excess or insufiicient tension comprising afirst mounted electrical signalling unit which is responsive to aninsufficient tension condition in a running yarn to terminate the yarnbeaming operation, a second electrical signalling unit responsive to anexcess tension condition in the running yarn to terminate the yarnbeaming operation, said unit being mounted at a point to one side of thefirst signalling unit, a yarn carrying actuating unit for the signallingunits loosely positioned over the first signalling unit, said actuatingunit contacting and actuating the first signalling unit when the yarn istraveling under insutficient tension, a projection formed on one surfaceof the signalling actuating unit, and a recess in the second signallingunit in which the projection on the actuating unit becomes seated toactuate the second signalling unit when the actuator is raised to aspecified height by excess tension in the yarn.

2. A stop motion assembly for use in terminating yarn beaming operationswhen a yarn is running under excess or insufficient tension comprising afirst mounted electrode bar which responds to insufiicient tension in arunning yarn to terminate the yarn winding or unwinding operation, asecond electrode bar which is responsive to an excess tension conditionin a running yarn to terminate the yarn beaming operation, said secondelectrode bar being mounted at a point to one side of the firstelectrode bar, a double acting yarn carrying dropwire having a slottherein by which it is loosely positioned over the first electrode barfor actuating the bars, said drop-wire contacting and actuating thefirst electrode bar when the yarn is traveling under insufficienttension, 21 hook-shaped projection formed on one edge of the drop-wire,and a recess in the second electrode bar in which the hook-shapedprojection of the drop-wire becomes seated to actuate the second barwhen the wire is raised to a specified height by excess tension in theyarn. I

3. A stop motion assembly for use in terminating yarn beaming operationswhen ayarn is running under excess or insufiicient tension according toclaim 2 wherein the electrode bar is slanted or inclined toward thefirst electrode bar.

4. A stop motion assembly for use in terminating yarn beaming operationswhen a yarn is running under excess or insuificient tension according toclaim 3 wherein the recess of the second electrode bar is formed in thetop portion of the bar.

5. A stop motion assembly for use in terminating yarn beaming operationswhen a yarn is running under excess or insufiicient tension according toclaim 4 comprising a layer of insulation on that surface of the secondelectrode bar which lies adjacent the double acting drop-wire and firstelectrode bar, said double acting drop-wire riding in continuous contactwith the insulated layer on the second electrode bar when the yarn isrunning under normal tension conditions.

6. A stop motion assembly for use in terminating yarn beaming operationswhen a yarn is running under excess or insufiicient tension comprising afirst mounted electrode bar which responds to insulficient tension in arunning yarn to terminate the yarn beaming operation, an electricallygrounded casing extending partially around the first electrode bar, asecond electrode bar responsive to an excess tension condition in arunning yarn to terminate the yarn beaming operation, said secondelectrode bar being mounted at a point to one side of and inclinedtoward the first electrode bar, a layer of in sulation on the surface ofthe second electrode bar facing the first bar, a double acting yarncarrying drop-wire having a slot therein by which it is looselypositioned over the first electrode bar for actuating the electrodebars, said drop-wire contacting and actuating the first electrode barwhen the yarn is traveling under insufiicient tension, at hook-shapedprojection formed on one surface of the drop-wire, and a recess in thesecond electrode bar in which the hook-shaped projection of the dropwirebecomes seated to actuate the second bar when the wire is raised to aspecified height by excess tension in the yarn, said second electrodebar being connected with the grounded casing of the first electrode barthrough contact with the drop-wire which is in turn in contact with thegrounded casing.

7. A stop motion assembly for use in terminating yarn beaming operationswhen a yarn is running under excess or insufiicient tension according toclaim 2 wherein the second electrode comprises a second point of contactfor the drop-wire, said second contact point being located above therecess whereby when the yarn passing through the yarn guide of thedrop-wire is subjected to sudden and prolonged tensioning which jerksthe wire above the recess of the second electrode bar the wire will becarried forward by the yarn drag exerted thereupon to contact the secondraised contact point.

8. A stop motion assembly for use in terminating yarn beaming operationswhen a yarn is running under excess or insufiicient tension comprising afirst mounted elongated electrode bar which responds to insufiicienttension in a running yarn to terminate the beaming operation, a secondelongated electrode bar responsive to an excess tension condition in arunning yarn to terminate the yarn beaming operation, said secondelectrode bar being mounted at a point to one side of and inclinedtoward the first bar, a plurality of double-acting yarn carryingdrop-wires each having elongated slots therein by which they are looselypositioned over the first electrode bar for actuating the electrodebars, said drop-wire contacting and actuating the first electrode barwhen the yarn is traveling under insufficient tension, a hook-shapedprojection formed on a surface of each wire, and an elongated recess inthe second electrode bar in which the hook-shaped projections of thedrop-wires become seated to actuate the second bar when they are raisedto a specified height by excess tension conditions in the running yarns.

References Cited in the file of this patent UNITED STATES PATENTS1,857,837 Blackman May 10, 1932 FOREIGN PATENTS 259,947 Germany May 16,1913 645,803 Germany June 5, 1937

